Mesomesial impacted molar centralizing device

Abstract

A main arch wire is fixed on at least two other teeth on one side of an impacted molar through a fixing piece, a round tube is fixed on the impacted molar, the round tube is fixedly connected with one end of a steel wire, the steel wire is bent, the other end of the steel wire is provided with a hook, the hook is fixed on the main arch wire, and the other end of the steel wire is provided with a connecting rod. And the steel wire applies a force for strengthening the teeth to the circular tube. According to the device, centralizing of the mesial impacted molar and mesial moving of adjacent teeth beside the impacted molar are conducted at the same time, the interactive anchorage concept is utilized, anchorage is greatly saved, all force is applied to a dental arch, the device is simple in structure, easy to manufacture and safe in material, the comfort level of a patient is improved, the operation time beside a chair is shortened, and the treatment period is shortened.

Description

Technical Field

[0001] The present invention relates to the field of medical instruments, and in particular to dental medical instrument technology for orthodontics. Background Art

[0002] Tooth impaction refers to a pathological condition in which a tooth cannot erupt into its normal functional position. Mesial impaction of the second or third molar is common in the mouth. Not only does the mesial impaction of the molar affect the neat arrangement of the teeth, it also interferes with the occlusion, resulting in reduced chewing function. Long-term poor occlusal contact will further affect the health and stability of the temporomandibular joint. If a food retention area is formed between the impacted molar and the mesial adjacent tooth, caries is prone to occur, which can then develop into pulpitis, apical periodontitis and other diseases, endangering the function and health of the oral and maxillofacial system. Therefore, it is very necessary to correct mesial impaction of the molar, and the most ideal way to solve this problem is to vertically straighten the impacted molar and move it mesially.

[0003] Early loss of molars or extraction due to disease will lead to the destruction of the normal relationship between the molars and their adjacent teeth and opposing teeth. In a large number of clinical correction processes, orthodontists often need to move the patient's posterior teeth forward. Control the forward movement of molars, close the gap in the posterior teeth, and prevent the distal and vertical movement of the anterior teeth.

[0004] Existing devices or methods for vertical molars mainly include: surgical assisted verticalization, replantation after extraction, bonding buccal tubes on the buccal surface of impacted molars, verticalization with a fragment axial auxiliary arch and spiral push springs, and verticalization of tilted molars with a fragment arch combined with micro-implants.

[0005] For example, the public document with publication number CN215079988U, publication date December 10, 2021, and patent name "A compression spring for straightening mesial tilted molars" discloses a compression spring for straightening mesial tilted molars, which belongs to the field of oral orthodontic technology. Specifically, it includes a first bracket, a second bracket and a homemade compression spring, the first bracket and the second bracket include a back plate and a groove, the back plate is fixed on the side wall surface of the tilted molar to be straightened and the adjacent supporting tooth, the homemade compression spring includes straight archwires at both ends and a compression archwire in the middle, the straight archwire is fixed in the groove, the homemade compression spring forms a V-shaped angle between the supporting tooth and the tilted molar, and the homemade compression spring is in a compressed state.

[0006] However, the above devices or methods have certain defects in clinical practice. For example, the need for surgery or anchorage pins will increase the chance of infection and trauma. The vertical and mesial movement of the remaining molars must be performed in steps. After the molars are vertically aligned, the device must be replaced for mesial movement of the molars, which leads to complicated operation during follow-up visits, long chairside operation time, and poor comfort. Summary of the invention

[0007] The technical problem to be solved by the present invention is to realize a mesial impacted molar straightening device, which can realize the vertical straightening of the molar and the mesial movement of the adjacent teeth of the impacted molar synchronously under the intraoral interaction force in a simple, efficient and non-invasive way, thereby reducing the chairside operation time, shortening the treatment cycle and improving the patient's comfort.

[0008] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a mesial impacted molar straightening device, a main arch wire is fixed on at least two other teeth on one side of the impacted molar through a fixing piece, a round tube is fixed on the impacted molar, the round tube is fixedly connected to one end of the steel wire, the steel wire is bent and has a hook at the other end, the hook is fixed on the main arch wire, and the steel wire applies a force to the round tube to straighten the teeth.

[0009] The steel wire is composed of a hook, a movable connecting section, a first active force-applying section, a second passive force-applying section and a fixed section in sequence. The movable connecting section extends from the hook toward the gum, the first active force-applying section extends along the gum toward the impacted molar side, the second passive force-applying section is located near the fixed section of the first active force-applying section, and the second passive force-applying section is a T-shaped curved structure.

[0010] The T-shaped curve is a protruding part formed by bending a steel wire outward, and the internal shape of the T-shaped curve is T-shaped.

[0011] The fixing section is fixedly connected to the round tube through a stop ring, and the round tube is a smooth buccal tube or a bondable occlusal pad with a round tube.

[0012] The main arch wire is a stainless steel square wire or a stainless steel round wire, and the hook is fixed to the main arch wire by fluid resin.

[0013] A protruding free traction hook is provided on the fixing piece adjacent to the impacted molar, the free traction hook is connected to one end of the elastic traction piece, and the other end of the elastic traction piece is fixed on the steel wire between the first active force application section and the fixing section.

[0014] The elastic traction member is a chain-shaped leather ring, a constant force tension spring or an elastic rubber ring.

[0015] The steel wire is a combination of an orthodontic stainless steel square wire and a stainless steel round wire. The length of the stainless steel square wire is adjustable, and the length of the stainless steel round wire segment is fixed at 8-12 mm.

[0016] There are three fixing parts for fixing the main arch wire, which are respectively fixed on the teeth adjacent to the impacted molar.

[0017] The present invention allows the straightening of the mesial impacted molar and the mesial movement of the adjacent teeth of the impacted molar to be performed simultaneously, and utilizes the concept of mutual support to greatly save support, so that all forces are applied in the dental arch. The device has a simple structure, is easy to manufacture, and uses safe materials, which improves patient comfort, reduces chairside operation time, and shortens the treatment cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following is a brief description of the contents expressed in each figure in the specification of the present invention and the marks in the figure:

[0019] Figure 1 This is a schematic diagram of the use of the mesial impacted molar correction device;

[0020] Figure 2 This is a schematic diagram of the main part of the mesial impacted molar correction device;

[0021] The markings in the above figures are: 1. steel wire; 2. fixed section; 3. second passive force-applying section; 4. first active force-applying section; 5. elastic traction member; 6. free traction hook; 7. hook; 8. round tube; 9. fixing member; 10. main arch wire. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the specific implementation methods of the present invention, such as the shape, structure, relative position and connection relationship between the various components involved, the function and working principle of each part, the manufacturing process and operation method, etc., through the description of the embodiments with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0023] The mesial impacted molar correction device is a tooth correction device, which is particularly suitable for vertically correcting impacted molars and mesially moving adjacent teeth of impacted molars. The orthodontic device is formed by bending a steel wire 1, and the specific structure is as follows Figure 2 As shown, Figure 1 The structure diagram of the orthodontic device for vertically and mesially moving mandibular molars is shown. The present invention utilizes the concept of mutual support to vertically move the adjacent teeth of the impacted molars while mesially moving the adjacent teeth of the impacted molars through the elastic traction member 5, so that all correction forces are applied to the dental arch. The verticalization of the mesial impacted molars and the mesial movement of the adjacent teeth are carried out simultaneously, which reduces the chairside operation time and shortens the treatment cycle. In addition, the device is simple to manufacture, has little foreign body sensation, and is highly comfortable for patients.

[0024] The mesial impacted molar correction device needs to be fixed with a main arch wire 10 on at least two other teeth on one side of the impacted molar through a fixing piece 9. The main arch wire 10 is a stainless steel square wire or a stainless steel round wire. The length is determined according to the fixed position. The main arch wire 10 is used to fix one end of the core component steel wire 1. Along the extension direction of the steel wire 1, there are a hook 7, a movable connection section, a first active force section 4, a second passive force section 3, and a fixed section 2. The steel wire 1 uses a combination of orthodontic stainless steel square wire and stainless steel round wire, that is, the steel wire 1 is divided into two sections, which are composed of orthodontic stainless steel square wire and stainless steel round wire. The length of the stainless steel square wire is adjustable, and the length of the stainless steel round wire section is fixed at about 10 mm. The hook 7, the movable connection section, the first active force section 4, and the second passive force section 3 use stainless steel square wire, and the fixed section 2 uses stainless steel round wire. The square wire has a rectangular cross-section. Its advantage is that the steel wire 1 is highly rigid and can better transmit the force of the elastic traction member 5 through the lever arm. The round wire is connected to the round tube 8 in the impacted tooth retainer and can exert a force in the distal vertical direction, facilitating the distal tilting movement of the impacted molar.

[0025] The movable connecting section is used to fix one end of the orthodontic device on the stainless steel wire 10 between the molars and premolars. Preferably, a bent hook 7 is provided at the front end of the movable connecting section, and the hook 7 can slide freely on the main arch wire 10. When adjusted to a suitable position, the hook 7 and the main arch wire 10 are connected and fixed by fluid resin. The fixing method of the hook 7 plus the fluid resin is not only convenient for pre-fixing the position, but also can be reliably fixed after the position is determined. The hook 7 is simple and easy to make, and easy to clean. When implanted in the mouth, no food residue will remain, which is beneficial to oral hygiene.

[0026] The movable connecting section extends from the hook 7 toward the gum, and the extended portion after the rear end of the movable connecting section is bent is the first active force-applying section 4, which is used to provide a force to vertically straighten the impacted molar and a correction force to move the molar mesially. The first active force-applying section 4 extends along the gum toward the impacted molar side, and the whole is an arc-shaped structure arranged along the gum. The buccal side of the first active force-applying portion is applied to the tooth through an elastic traction member 5 to provide a correction force in the mesial direction and move the adjacent teeth next to the impacted tooth mesially. At the same time, the reaction force corrects the mesial impacted molar, and the gap provided after the adjacent teeth move mesially is more conducive to the mesial impaction. For the correction of molars, in order to more reliably maintain the correction force of the first active force-applying segment 4, a fixing mechanism is set on the steel wire 1 (first active force-applying segment 4) between the first active force-applying segment 4 and the fixing segment 2. The fixing mechanism can select a buccal tube or bracket on the buccal side and a lingual buckle on the lingual side. The free traction hook 6 and the fixing mechanism are connected by an elastic traction member 5 to maintain the directional consistency of the correction force. The free traction hook 6 is located on the jaw side. The purpose of being located on the jaw side is to reduce the mesial tilt when the molar segment moves mesially. The elastic traction member 5 can select a chain leather ring, a constant force spring or an elastic rubber ring of suitable length. The buccal side of the first active force-applying part is applied on the tooth through the elastic traction member 5 to provide a corrective force in the mesial direction, and to move the adjacent teeth next to the impacted tooth mesially. At the same time, the reaction force corrects the mesial impacted molars, and the gap provided after the adjacent teeth move mesially is more conducive to the correction of the mesial impacted molars. The lingual side of the first active force-applying part is applied on the lingual buckle and the combined traction hook through the elastic traction member 5 to provide a corrective force in the mesial direction of the lingual side, so that the mesially moved teeth move parallelly and quickly, avoiding side effects such as large friction and tooth twisting.

[0027] A second passive force section 3 is provided at the end of the first active force section 4, that is, the second passive force section 3 is located near the fixed section 2 of the first active force section 4. The second passive force section 3 is used to extend the first active force section 4 to further straighten the molars and move the adjacent teeth mesially. The second passive force-applying section 3 is a T-shaped curved structure. Specifically, the T-shaped curve includes a torque portion (the top of the protruding portion), and a first force arm and a second force arm located on both sides of the torque portion and relatively close to each other. The torque generated by the torque portion can extend the active force-applying section mesially through the free end of the first force arm, thereby preventing the free end of the movable connection section from contacting its distal bracket or buccal tube to block further mesial movement of the adjacent teeth next to the impacted tooth; the first force arm and the second force arm are bent toward each other, and the torque portion and the first active force-applying section 4 are respectively connected above and below. Because the first active force-applying section 4 is arc-shaped as a whole, and is bent more toward the mesial impacted molar after the position of the second passive force-applying section 3, the torque generated by the torque portion can extend the first active force-applying section 4 mesially through the free end of the first force arm; the free end of the second force arm is connected to the fixed end, and a vertical force is generated toward the target molar through the reaction force of the elastic traction member 5 of the first active force-applying section 4.

[0028] The existence of T-curves makes the force of molar movement continuous and gentle, but the distance from the anchorage to the target molar limits the number of T-curves. The more T-curves there are, the more distance is required. According to the actual clinical situation, in general, one T-curve can meet the requirements of molar correction. Therefore, the anchorage provided by the first active force and the second active force is a mutual anchorage. The correction force acting on the impacted molar is fully released to move the adjacent teeth mesially, and space is released for the impacted molar, which is convenient for the further verticalization of the mesial impacted molar. There is no loss of anchorage, and it can move the molar more efficiently than traditional anchorage.

[0029] The T-shaped curve is usually placed in the buccal shelf area, where the space is limited. For patients with shallow vestibule groove, tight buccal muscles, and low elasticity of buccal mucosa, if there are too many T-shaped curves, the width is too wide, or the height is too high, the patient experience will be poor when wearing orthodontic devices for a long time. This device only bends one T-shaped curve, and the height and width requirements are not high, so the patient comfort is high.

[0030] After the steel wire 1 is fixed, the impacted molar will stand upright after the elastic traction member 5 applies force, and the reaction force of the elastic traction member 5 will cause the adjacent teeth of the impacted teeth to move mesially, and the active force-applying section of the archwire will slide distally until the movable section hook 7 contacts the buccal tube of the molar or the bracket of the premolar. If force is continued after contacting the molar, the adjacent teeth of the impacted teeth that have moved mesially will move distally, causing reciprocating motion, which is not conducive to the patient's correction; the active force-applying section can be extended mesially through a T-shaped curve in front of the movable section hook 7 distal to the bracket or buccal tube to avoid reciprocating motion. If there is a gap in the premolar section of the movable connection section and the teeth in front of the gap need to be moved distally, the hook 7 can be close to the buccal tube of the molar or the bracket of the premolar, and force is continued after contact to move the contacting teeth distally; there is no need to bend the passive force-applying section.

[0031] The second passive force-applying section 3 is connected to the fixed section 2, the fixed section 2 is bent toward the mesial impacted molar, and a round tube 8 is fixed on the impacted molar, and the end of the fixed section 2 is fixed to the round tube 8, wherein the round tube 8 is a smooth buccal tube or a bondable occlusal pad with a round tube 8. The purpose of the round tube 8 is to facilitate the application of thrust on the retaining member of the impacted molar, and there is a round tube 8 brake ring in front of the round tube 8 to prevent the arch wire from slipping and increase the comfort of the patient. The fixed section 2 can be a stainless steel round wire of about 10 mm, and a stop ring can be added to the end of the fixed section 2 to prevent the arch wire from sliding, and it is bonded and fixed to the fixed connection member of the impacted molar. The fixed connection part of the impacted molar can be a round tube 8 or a round tube 8 with an occlusal pad. The force provided by the second active force-applying section of the bow acts on the impacted molar, causing the impacted molar to generate a vertical force. At the same time, the round tube 8 with the occlusal pad can form a fulcrum at the distal end of the impacted molar. Under the action of the occlusal force, a prying force is formed, making the mesial impacted molar easier to move distally, and can reduce friction so that all the correction force is used for distal correction of the impacted molar.

[0032] The working principle of orthodontic devices is explained as follows:

[0033] Determine the distance between the patient's impacted molar and the supporting tooth, and select the corresponding archwire length to bend the orthodontic device. The free end (hook 7) of the movable connection section of the orthodontic device wire 1 is fixedly connected to the main archwire 10. The orthodontic device is formed by bending a steel wire 1. The other end of the steel wire 1, i.e., the stainless steel round wire of the fixed section 2, is fixed to the round tube 8 of the impacted molar or the round tube 8 with the occlusal pad, and the stop ring is tightened.

[0034] After the two ends of the steel wire 1 of the orthodontic device are fixed, the elastic traction member 5 applies force to the buccal tube of the molar adjacent to the target molar to move the adjacent to the impacted molar mesially. The first active force-applying part includes a free traction hook 6 fixed on the jaw side of the stainless steel wire 1. The purpose of being located on the jaw side is to reduce the mesial inclination when the molar segment moves mesially. The reaction force of the elastic traction member 5 acts on the impacted molar to straighten the impacted molar.

[0035] The first active force-applying part applies a correction force in the mesial direction of the lingual side to the lingual buckle and the combined traction hook through the elastic traction member 5, so that the mesially moved teeth move parallel and quickly, avoiding side effects such as large friction and tooth twisting. The second passive force-applying section 3 applies force through the T-shaped curve, opens the distance between the first force arm and the second force arm, and then adjusts the position of the movable connection section, so that it moves mesially and away from the distal bracket or buccal tube, which facilitates further mesial movement of the adjacent teeth of the impacted tooth.

[0036] After the steel wire 1 is fixed, the impacted molar will stand upright after the elastic traction member 5 applies force, and the reaction force of the elastic traction member 5 will cause the adjacent teeth of the impacted tooth to move mesially, and the active force-applying section of the arch wire will slide distally until the movable section hook 7 contacts the buccal tube of the molar or the bracket of the premolar. If force is continued after contacting the molar, the adjacent teeth of the impacted tooth that has moved mesially will move distally, causing reciprocating motion, which is not conducive to the patient's correction; the active force-applying section can be extended mesially through a T-shaped curve before the movable section hook 7 is distal to the bracket or buccal tube to avoid reciprocating motion.

[0037] If there is a gap between the movable connection section and the premolar section, and the teeth in the premolar section need to be moved distally, the hook 7 can be close to the molar buccal tube or the premolar bracket, and continue to apply force after contact to move the contacting teeth distally; there is no need to bend the passive force application section.

[0038] It can be seen from the above scheme that the orthodontic device in the present application not only provides continuous mesial movement correction force, but also provides vertical correction force, realizing vertical movement of impacted teeth and mesial movement of adjacent molars at the same time, reducing chairside operation time, shortening treatment cycle, and improving patient comfort. In addition, through the fulcrum formed in the distal part of the impacted molar by the circular tube 8 with occlusal pad, the occlusal force is used to form a prying force, so as to better vertically move the molar distally.

[0039] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A device for straightening mesial impacted molars, characterized in that: A main arch wire is fixed to at least two other teeth on one side of the impacted molar through a fixing piece, a round tube is fixed to the impacted molar, and the mesial impacted molar straightening device is made of stainless steel wire, one end of which is a round wire and the other end is a square wire, the round wire end is inserted into the round tube, and a hook is provided at the other end of the square wire, and the hook is fixed on the main arch wire. A rubber band connects the straightening device and the main arch wire to apply a force to the round tube to straighten the teeth.

2. The mesial impacted molar straightening device according to claim 1, characterized in that: The steel wire is composed of a hook, a movable connecting section, a first active force-applying section, a second passive force-applying section and a fixed section in sequence. The movable connecting section extends from the hook toward the gum, the first active force-applying section extends along the gum toward the impacted molar side, the second passive force-applying section is located near the fixed section of the first active force-applying section, and the second passive force-applying section is a T-shaped curved structure.

3. The mesial impacted molar correction device according to claim 2, characterized in that: The T-shaped curve is a protruding part formed by bending a steel wire outward, and the internal shape of the T-shaped curve is T-shaped.

4. The mesial impacted molar correction device according to claim 3, characterized in that: The fixing section is fixedly connected to the round tube through a stop ring, and the round tube is a smooth buccal tube or a bondable occlusal pad with a round tube.

5. The mesial impacted molar straightening device according to claim 4, characterized in that: The main arch wire is a stainless steel square wire or a stainless steel round wire, and the hook is fixed to the main arch wire by fluid resin.

6. The mesial impacted molar correction device according to claim 5, characterized in that: A protruding free traction hook is provided on the fixing piece adjacent to the impacted molar, the free traction hook is connected to one end of the elastic traction piece, and the other end of the elastic traction piece is fixed on the steel wire between the first active force application section and the fixing section.

7. The mesial impacted molar correction device according to claim 6, characterized in that: The elastic traction member is a chain-shaped leather ring, a constant force tension spring or an elastic rubber ring.

8. The mesial impacted molar straightening device according to any one of claims 1 to 7, characterized in that: The steel wire is a combination of an orthodontic stainless steel square wire and a stainless steel round wire. The length of the stainless steel square wire is adjustable, and the length of the stainless steel round wire segment is fixed at 8-12 mm.

9. The mesial impacted molar correction device according to claim 8, characterized in that: There are three fixing parts for fixing the main arch wire, which are respectively fixed on the teeth adjacent to the impacted molar.

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